Musicpal: Fix wm8750 I2C address

Commit b3a21988 uncovered that we attached the Wolfson with an I2C
address shifted left by one. Fixing this makes sound work again for
the Musicpal.
Signed-off-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: Nmalc <av1474@comtv.ru>

hw/musicpal.c

@@ -67,7 +67,7 @@
 #define MP_AUDIO_IRQ            30
 
 /* Wolfson 8750 I2C address */
-#define MP_WM_ADDR              0x34
+#define MP_WM_ADDR              0x1A
 
 /* Ethernet register offsets */
 #define MP_ETH_SMIR             0x010